Valve mechanism for internal-combustion engines.



A. J. SEAMAN.

VALVE MECHANISM FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED MAR. 15. l9l5.

1,165,291. Patented Dec. 21, 1915.

, ing is a specification.

UNITED STATES PATENT OFFICE.

ALBERT J". SEAMAN, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO SEAMAN ENGINE CO.,

OF BOSTON, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

VALVE MECHANISM FOR INTERNAL-COMBUSTION ENGINES.

' Specification of Letters Patent.

I Patented Dec. 21, 1915.

Application filed March 15, 1915. Serial No, 14,308.

citizen of the United States} residing at Boston, in the county of Sufiolk and State of Massachusetts, have invented an Improvement in Valve Mechanism for Internal Combustion Engines, of which the followhis invention relates to unprovements in valve-mechanism for internal combustion. engines for controlling the inlet and exhaust, arid is intended as an improvement upon the valve-mechanism of my" application #866,939, filed October 15, 1914.

The' valve-mechanism, in general, comprises a casing having a pair of alined frusto-conical valve seats having orts oommunicating with the engine-cylinder, a pair of hollowfrusto-conical valve-bodies adapted for engagement with said seats having ports to move; into register with the ports in 1 the casing, when rotated, connecting-means for said valve-bodies and means for rotating said valve-bodies. Insaid application the valve-bodies are connected together by connecting-means which provides for rotation of said bodies in *unison', andadmitsof a slight axial movement of each body independently, so that said bodies will'enga-ge their-seats with substantially equal pres-- sures at all times, and gearing is arranged in connection with said connecting-means for rotating the valve-bodies.

The present invention has for its object the provision of another form of connecting- I means for the valve-bodies, :and means i for rotating them, in lieu of the connectingmeans and gearing of said application, which may be easily constructed, and which admits of the rotating-meansbeing extended through a plurality of valve-mechanisms which are associated with the corresponding numbe'r of engine cylinders.

Figure 1 is acentral longitudinal vertical section of a valve-mechanism for internal combustion engines embodying this invention. ,Figs. 2 and 3 are transverse vertical sections taken, respectively, on the. dotted lines 2-2,and 3-3, Fig. 1. Fig. 4 is a detail, in elevation, of the connecting-means for the valve-bodies and rotating-means therefor. Fig. 5 is a detail of the connect in -element.

iteferring to the drawings, 10 represents the-upper end-portion of anengine-cylinder means. The valve-body 16, has a port 36, in its side wall adapted to be brought into register with a port 38, which communicates wlth the top of the cylinderlO, which may constitute the: exhaust, and the valve-body 18, has a small port 36 adapted to be brought into register'with a-port 4:0, which'als'o communicates with the top of the engine-cylin der, and may constitute the inlet. I

' The valve-body 18., communicateswith a supply of combustible which enters the easing through theport 22, and the valve-body 16, may communlcate with the atmosphere through the port 21. The connecting-means .for the valve-bodies is mounted for rotation in the bridge-wall, and consists of a hub having a cylindrical portion 23, which is arranged in a correspondingly shaped orifice in, the bridge-wall, and having polygonal end-portions 24. 24, projecting from opposite sides of the bridge-wall, and having cylindrical portions'25, 25, extended beyond said polygonal -portions, which; may be screw-threaded for a portion of their length.

The center-holes in the end walls of'the valve-bodies are shaped to fit upon the polygonal portions 24, 24, of the hub, so that the hub thus connects the two valve-bodies together for rotation, yet they are 'permitted to slide on .said' polygonal portions slightly, to compensate for expansion and contraction. On one of the cylindrical endportions-25 ofv the hub, a thermal compensating-device is arranged, comprising one or more pairs of washers 71, 72, the washer 71 being'composed of copper and the washer 72 being composed of steel, or, inlieu thereof, other metals having'difi'erent ratios of expansion may be employed. The washers are made of adiameter larger than the hub so as to extend over the inner face of the wall 20 of the valve-body.-to hold said body in place on the hub; The washer 71 has its ace adjacent the washer 72 formed with a circular recess, the edge of which is beveled, and the washer 72 has its face adjacent the washer 72, formed, with a beveled edge, and

the beveled edges engage each other, but the washer 72 doesnot bottom in the recess in the Washer 71. The washers slide on the cylindrical portion of the hub, and a nut is threaded on the hub to hold the washersin place thereon and to provide for manual adjustment. These washers normally are, in thepggregate, of a predetermined thickness, but when subjected to variations in temperature, the aggregate thickness varies accord-' mgly, and, as a result, the pressure of the valve-bodies on their seats will be relieved upon the occurrence of a high temperature. On the other cylindrical end-portion 25 of the hub, a collar 73, is arranged, whichv extends over the inner faceof the wall 20 of the valve-bodyf'aiid'a long sleeve 74 is splined on the cylindrical portion next said washer, and anut 75 is threaded on the cylindrical portion next the sleeve, and a spring is arranged on the sleeve which is connected at one end with the sleeve and at the other end with the nut by which the nut is keptcturned up tightly thereby to take up wear.

The thermal compensating device here shown, and the'means here shown'for tak ing'up wear, are substantially the. same as in my application aforesaid, but herein they are arranged on the cylindrical end-por-' tions of a hub, upon which the valve-bodies are mounted. Said hub has a polygonal center-hole extended throughout its length and a correspondin ly shaped shaft 27 is-extend-- ed through s'ai hub, which likewise extends 1. A valve-mechanism for internal combustion englnes, comprising a casmg havmg a pair of alined frustoconical valve seats separated by a bridge-wall, a pair of hollow frusto comcal valve bodies engaging said seats, both the valve-bodies and the seats.

having ports, a rotating hub upon which both valve-bodies" are mounted for rotation -with the hub, and for axial movements on the hub, and a shaft extended through the hub for rotating it. v

2. A valve-mechanism for internal, com;

bustion engines, comprising a casingihaving a pair of alined frustoconical valveseats separated by a bridge-wall, a pair of hollow frusto-conical valve-bodies engaging said seats, both the valve-ligdiesand the seats 1 having ports, a hub rotatably mounted-in the bridge-wall having projecting end-portions upon which the valve-bodies are vmounted for rotation with the hub, and for axial movements on the hub, and means for rotating said hub.

3. A valve-mechanism for internal combustion engines, comprising a casing having a pair of. alined frusto conical val ve seats separated by a bridge-wall, a pair of hollow frusto-conical valve-bodies engaging said seats, both the valve-bodies and the seats having ports, a hub rotatably mounted in the bridge-wall having projecting end-portions upon which the valve bodies are mounted for rotation with the hub, and for axial movements on the hub,- said hub having a polygonal center-hole through it,

and a rotatable polygonal shaft extended through the hub and the valve-bodies.-

4. A valvemechanism for internal combustion engines, comprising a casing having a pair of alined frustoconical valveseats separated by a bridge-wall, a pair of hollow frusto-conical valve-bodies engaging said seats, both the valve-bodies and the seats having ports, means connecting said valvebodies together for rotation in unison, which admits of axial movements thereof, and a rotatable shaft extended longitudinally through the valve-bodies and the connectingmeans.

5. A valve-mechanism for internal combustion engines, comprising a casing having a pair'of alined frus'to-conical valve-seats separated by a bridge-'wall, a. .pair of hol- 10w frusto-conical valve-bodies engaging said seats, both the valve-bodies and the seats having ports, a hub rotatablymountedin the bridge-wall having projecting endportions upon which the, valve-bodies are mounted for rotation with the hub and for I axial movements on the hub, a thermal compensating-device arranged on the hub and in engagement with one of the valve-bodies, and means forrotating the hub.

6.' A valve-mechanism for internal com bustion engines, comprising a casing having a pair of alined frusto-conical valve-seats separated by abridge-wall, a pair of hollow frusto conical valve -bodies engaging said seats, both the valve-bodies and the' seats havin ports, a hub rotatably mounted in the bri ge-wall having projectin g end-' portions upon which the valve-bodies are mounted for rotation with the hub and for axial movements on the hub, a thermal compensating-device arranged on the hub and in engagement with one of the valve-bodies,

and a shaft extended through the hub for rotating it.

7. A valve-mechanism for internal' combustion engines, comprising'a casing having separated by a bridge-wall, a pair of hollow frusto-conical valve-bodies engaging said a pair of alined frusto-conic'al valve-seats I seats, both the valve-bodies and the seats having ports, a hub rotatably mounted in the bridge-wall having projecting end-pen tions upon which the valve-bodies are mounted for rotation with the hub and for axialmovements on the hub, a sliding collar arranged on the hub in engagement with one of the valve-bodies and automatic means for holding it in engaging position, said means including a sprlng arranged for torsional action when permitted, and means for rotating the'hub.

8. A valve-mechanism for internal combustion engines, comprising a casing having a pair of alined frusto-conical valve-seats separated by a bridge-wall, a pair of hollow frusto-conical valve-bodies engaging said sea-ts, both the valve-bodies and the 'seats having ports, a hub rotatably mounted in the bridge-wall having projecting end-portions upon which the valve-bodies are mounted for rotation with the hub and for axial movements on the hub, a sliding collar arranged on the hub in engagementwith one of the valve-bodies and automatic means separated by a bridge-wall, a pair of hollow frusto-conical valve-bodies engaging said seats, both the valve-bodies and the seats having ports', a hub rotatably mounted in the bridge-wall having projecting end-portions upon which the valve-bodies are mounted for rotation with the hub and for axial movements on the hub, a thermal compensating-device arranged on one end-portion of the hub and in engagement with one of the valve-bodies and means arranged on the other end-portion of the hub and engaging the other valve-body and arranged for holdingthe. parts assembled and for taking up Wear, and means for rotating the bustion engines, comprising a casing having a pair of alined frusto-conical valve-seats separated by a bridge-wall, a pair of hollow frusto-conic'al valve-bodies engaging said seats, both the valve-bodies and the seats havin ports, a hub rotatably mounted in the bridge-wall having projecting endportions upon which the valve-bodies are mounted for rotation with the hub and for axial movements on the hub, a thermal compensating-device arranged on one end-portion of the hub and in engagement with one of the valve-bodies and means arranged on the other end-portion of the hub and engaging the other valve-body-and arranged for holding the parts assembled and for taking up wear, and a shaft extended through the hub for rotating it and the valve-bodies supported by it.

In testimony whereof I have signed my 1 name to this specification, in the presenceof two subscribing witnesses.

ALBERT J. SEAMAN.

Witnesses:

B. J. Noirns, H. B. DAVIS.

= 10. A valve-mechanism for internal com- I 

